Two Network Cards With Different Settings For Internet Access (Newbie)

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I second Irithori. Check the gateway of each ethernet and set see to it that they are not the same for both Ethernets. For example 192.168.0.1 for eth0 and 192.168.1.1 for eth1. Of course you will have to connect each Ethernet to its respective router and cannot use one router for different gateway unless you have a VLAN setup.

My question would be does the same ip address come up on the same card every time after reboot? What you are seeing could be a case where the system changes the interface on reboot, which I have seen before. I fixed this by adding the MAC Address of the card to the config file I wanted it to boot with.